All rasa commands show errors after successful installation

[PilgrimViis]

Rasa version:
1.5.2
Rasa SDK version (if used & relevant):

Rasa X version (if used & relevant):
0.23.3
Python version:
Python 3.6.9 :: Anaconda, Inc.
Operating system (windows, osx, ...):
Windows 10
Issue:
After successful installation of Rasa on trying to iniitialize using rasa init an error is thrown. Rasa installed in anaconda virtual environment by using command from rasa installation guide
pip install rasa-x --extra-index-url https://pypi.rasa.com/simple
And looks like all rasa commands throws the same error. Even rasa --version

Error (including full traceback):

(rasa) F:\Projects\Testing\rasa>rasa init
Traceback (most recent call last):
  File "c:\programdata\anaconda3\envs\rasa\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\programdata\anaconda3\envs\rasa\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\ProgramData\Anaconda3\envs\rasa\Scripts\rasa.exe\__main__.py", line 4, in <module>
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\__init__.py", line 8, in <module>
    from rasa.run import run
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\run.py", line 7, in <module>
    from rasa.core.lock_store import LockStore
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\core\__init__.py", line 5, in <module>
    from rasa.core.train import train
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\core\train.py", line 11, in <module>
    from rasa.core.domain import Domain
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\core\domain.py", line 11, in <module>
    import rasa.utils.common as common_utils
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\utils\common.py", line 7, in <module>
    import rasa.core.utils
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\core\utils.py", line 27, in <module>
    from sanic import Sanic
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\sanic\__init__.py", line 2, in <module>
    from sanic.app import Sanic
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\sanic\app.py", line 18, in <module>
    from sanic.asgi import ASGIApp
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\sanic\asgi.py", line 22, in <module>
    from sanic.compat import Header
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\sanic\compat.py", line 4, in <module>
    class Header(CIMultiDict):
TypeError: type 'multidict._multidict.CIMultiDict' is not an acceptable base type

Command or request that led to error:

rasa init, rasa --version, rasa --help. Looks like all of them

Content of configuration file (config.yml) (if relevant):

Content of domain file (domain.yml) (if relevant):

[bhavaniravi]

having the same issue MacOS, Python 3.7

Turns out it was an issue with sanic server's dependency multidict downgrading it helped me get rasa running

sanic-org/sanic#1729 (comment)

[PilgrimViis]

@bhavaniravi thank you very much. It helped me as well.

[sara-tagger]

Thanks for the issue, @Ghostvv will get back to you about it soon!

You may find help in the docs and the forum, too 🤗

[mav1797]

having the same issue MacOS, Python 3.7

Turns out it was an issue with sanic server's dependency multidict downgrading it helped me get rasa running

huge-success/sanic#1729 (comment)

how can i do that?